Some difficulty in acquiring reliable measurements triggered a point of interest from previous experiences. Why did some technicians place precision attenuators on one or both VNA cables as part of a setup for measuring passive devices? “It’s always been there.” But like all things, there must be a reason.Read More...

FROM WHERE WE SIT

Will OpenRFM Shake Up the Microwave Industry?By Barry Manz

Throughout the history of the RF and microwave industry there has never been a form factor standardizing the electromechanical, software, control plane, and thermal interfaces used by integrated microwave assemblies (IMAs) employed in defense systems. Rather, every system has been built to meet the requirements of a specific system, which may be but probably isn’t compatible with any other system. It’s simply the way the industry has always responded to requests from subcontractors that in turn must meet the physical, electrical, and RF requirements of prime contractors. Read More...

CURRENT ISSUE PRODUCTS

Band Reject Filter SeriesHigher frequency band reject (notch) filters are designed to operate over the frequency range of .01 to 28 GHz. These filters are characterized by having the reverse properties of band pass filters and are offered in multiple topologies. Available in compact sizes.RLC Electronics

SP6T RF SwitchJSW6-33DR+ is a medium power reflective SP6T RF switch, with reflective short on output ports in the off condition. Made using Silicon-on-Insulator process, it has very high IP3, a built-in CMOS driver and negative voltage generator.Mini-Circuits

Group Delay Equalized Bandpass FilterPart number 2903 is a group delayed equalized elliptic type bandpass filter that has a typical 1 dB bandwidth of 94 MHz and a typical 60 dB bandwidth of 171 MHz. Insertion loss is <2 dB and group delay variation from 110 to 170 MHz is <3nsec.KR Electronics

Absorptive Low Pass FilterModel AF9350 is a UHF, low pass filter that covers the 10 to 500 MHz band and has an average power rating of 400W CW. It incurs a rejection of 45 dB minimum at the 750 to 3000 MHz band, and power rating of 25W CW from 501 to 5000 MHz.Werlatone

LTE Band 14 Ceramic DuplexerThis high performance LTE ceramic duplexer was designed and built for use in public safety communication and commercial cellular applications. It operates in Band 14 and offers low insertion loss and high isolation to enable clear communications in the LTE network. Networks International

In the wireless industry’s never-ending quest to grab spectrum where it can find it, the
CTIA has asked the FCC to reallocate 15 MHz of contiguous spectrum for wireless use, suggesting that the Broadcast Auxiliary Service (BAS) frequencies used for electronic news gathering (ENG) by the broadcast industry are a great place to start. In a white paper called “Finding the FCC’s 15 MHz,” CTIA presents its rationale for why using 15 MHz of spectrum between 2095 to 2110 MHz is a good choice, primarily that it is near existing wireless allocations. ENG only transitioned there since 2005 as part of spectrum swap in which ENG systems began using radios with digital rather than analog modulation schemes receivers and 35 MHz was relocated for it.

Obviously, the National Association of Broadcasters immediately took issue with the proposal. NAB Executive VP of Communications Dennis Wharton said in the prepared statement that “If CTIA’s request were not such a serious threat to public safety, it would be amusing. Every day, local TV stations use broadcast auxiliary spectrum to provide breaking coverage of devastating storms, tornadoes, hurricanes and wildfires. If Superstorm Sandy demonstrated anything, it is that broadcast television serves as a lifeline in times of emergency, where cellphone/wireless architecture has failed.”

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•The Design of Ultra Narrowband Amplifiers Using Small-Signal Varactor UpconvertersThis paper presents a method of realizing tunable microwave amplifiers with ultra narrow bandwidths that can be less than 0.5% by the use of a varactor up-converter (UC).Planar Monolithics

•Directivity and VSWR MeasurementsReturn loss and VSWR measurements are complicated by the finite performance of the directional device used to measure the reflected power. The only accurate and convenient way to make return loss measurements is with a well matched high directivity directional coupler or bridge.Marki Microwave

•Switch Solutions for Systems with Low PIM RequirementsDow-Key Microwave has invested in R&D for new RF switch products designed specifically to reduce intermodulation (IM) in coaxial switches. Dow-Key Microwave